The way you pick up stitches and seam the edges can also be different. They both look nice, very slightly different, and are done differently. It's just a personal preference. You may even prefer one way for open edges, and the other way for seams. They can both work well for both; it really just depends on what you like.
Maybe "controversial" is too strong a word. People do tend to be die-hards, though, either always slipping, or always not!
KnittingHelp Queen Bee
"Don't ask yourself what the world needs. Ask yourself what makes you come alive and then go do that. Because what the world needs is people who have come alive." Howard Thurman